<?php // $Id: question.php,v 1.49.2.1 2007/11/02 16:20:23 tjhunt Exp $
/**
 * Page for editing questions using the new form library.
 *
 * @author T.J.Hunt@open.ac.uk
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package questionbank
 *//** */

// Includes.
require_once(dirname(__FILE__) . '/../config.php');
require_once(dirname(__FILE__) . '/editlib.php');
require_once($CFG->libdir . '/filelib.php');
require_once($CFG->libdir . '/formslib.php');

// Read URL parameters telling us which question to edit.
$id = optional_param('id', 0, PARAM_INT); // question id
$qtype = optional_param('qtype', '', PARAM_FILE);
$categoryid = optional_param('category', 0, PARAM_INT);

$cmid = optional_param('cmid', 0, PARAM_INT);
$courseid = optional_param('courseid', 0, PARAM_INT);
$wizardnow =  optional_param('wizardnow', '', PARAM_ALPHA);
$movecontext =  optional_param('movecontext', 0, PARAM_BOOL);//switch to make question
					//uneditable - form is displayed to edit category only
$returnurl = optional_param('returnurl', 0, PARAM_LOCALURL);

$inpopup = optional_param('inpopup', 0, PARAM_BOOL);

if ($movecontext && !$id){
	print_error('questiondoesnotexist', 'question', $returnurl);
}

if ($cmid){
	list($module, $cm) = get_module_from_cmid($cmid);
	require_login($cm->course, false, $cm);
	$thiscontext = get_context_instance(CONTEXT_MODULE, $cmid);
} elseif ($courseid) {
	require_login($courseid, false);
	$thiscontext = get_context_instance(CONTEXT_COURSE, $courseid);
	$module = null;
	$cm = null;
} else {
	error('Need to pass courseid or cmid to this script.');
}
$contexts = new question_edit_contexts($thiscontext);


if (!$returnurl) {
	$returnurl = "{$CFG->wwwroot}/question/edit.php?courseid={$COURSE->id}";
}



if ($id) {
	if (!$question = get_record('question', 'id', $id)) {
		print_error('questiondoesnotexist', 'question', $returnurl);
	}
	get_question_options($question);
} else if ($categoryid && $qtype) { // only for creating new questions
	$question = new stdClass;
	$question->category = $categoryid;
	$question->qtype = $qtype;
} else {
	print_error('notenoughdatatoeditaquestion', 'question', $returnurl);
}

// Validate the question category.
if (!$category = get_record('question_categories', 'id', $question->category)) {
	print_error('categorydoesnotexist', 'question', $returnurl);
}

//permissions
$question->formoptions = new object();

$categorycontext = get_context_instance_by_id($category->contextid);
$addpermission = has_capability('moodle/question:add', $categorycontext);

if ($id) {
	$canview = question_has_capability_on($question, 'view');
	if ($movecontext){
		$question->formoptions->canedit = false;
		$question->formoptions->canmove = (question_has_capability_on($question, 'move') && $contexts->have_cap('moodle/question:add'));
		$question->formoptions->cansaveasnew = false;
		$question->formoptions->repeatelements = false;
		$question->formoptions->movecontext = true;
		$formeditable = true;
		question_require_capability_on($question, 'view');
	} else {
		$question->formoptions->canedit = question_has_capability_on($question, 'edit');
		$question->formoptions->canmove = (question_has_capability_on($question, 'move') && $addpermission);
		$question->formoptions->cansaveasnew = (($canview ||question_has_capability_on($question, 'edit')) && $addpermission);
		$question->formoptions->repeatelements = ($question->formoptions->canedit || $question->formoptions->cansaveasnew);
		$formeditable =  $question->formoptions->canedit || $question->formoptions->cansaveasnew || $question->formoptions->canmove;
		$question->formoptions->movecontext = false;
		if (!$formeditable){
			question_require_capability_on($question, 'view');
		}
	}


} else  { // creating a new question
	require_capability('moodle/question:add', $categorycontext);
	$formeditable = true;
	$question->formoptions->repeatelements = true;
	$question->formoptions->movecontext = false;
}


// Validate the question type.
if (!isset($QTYPES[$question->qtype])) {
	print_error('unknownquestiontype', 'question', $returnurl, $question->qtype);
}
$CFG->pagepath = 'question/type/' . $question->qtype;


// Create the question editing form.
if ($wizardnow!=='' && !$movecontext){
	if (!method_exists($QTYPES[$question->qtype], 'next_wizard_form')){
		print_error('missingimportantcode', 'question', $returnurl, 'wizard form definition');
	} else {
		$mform = $QTYPES[$question->qtype]->next_wizard_form('question.php', $question, $wizardnow, $formeditable);
	}
} else {
	$mform = $QTYPES[$question->qtype]->create_editing_form('question.php', $question, $category, $contexts, $formeditable);
}
if ($mform === null) {
	print_error('missingimportantcode', 'question', $returnurl, 'question editing form definition for "'.$question->qtype.'"');
}
$toform = fullclone($question); // send the question object and a few more parameters to the form
$toform->category = "$category->id,$category->contextid";
if ($formeditable && $id){
	$toform->categorymoveto = $toform->category;
}
$toform->returnurl = $returnurl;
$toform->movecontext = $movecontext;
if ($cm !== null){
	$toform->cmid = $cm->id;
	$toform->courseid = $cm->course;
} else {
	$toform->courseid = $COURSE->id;
}
$toform->inpopup = $inpopup;
$mform->set_data($toform);

if ($mform->is_cancelled()){
	if ($inpopup) {
		close_window();
	} else {
		redirect($returnurl);
	}
} elseif ($fromform = $mform->get_data()){
	$returnurl = new moodle_url($returnurl);
	//select category that question has been saved in / moved to when we return to question bank
	if (!empty($fromform->categorymoveto)){
		$returnurl->param('category', $fromform->categorymoveto);
	} else if (!empty($fromform->category)){
		$returnurl->param('category', $fromform->category);
	}
	$returnurl = $returnurl->out();
	if (!empty($fromform->makecopy)) {
		$question->id = 0;  // causes a new question to be created.
		$question->hidden = 0; // Copies should not be hidden
	}
	if ($movecontext){
		list($tocatid, $tocontextid) = explode(',', $fromform->categorymoveto);
		$tocontext = get_context_instance_by_id($tocontextid);
		require_capability('moodle/question:add', $tocontext);
		if (get_filesdir_from_context($categorycontext) != get_filesdir_from_context($tocontext)){
			$movecontexturl  = new moodle_url($CFG->wwwroot.'/question/contextmoveq.php',
											array('returnurl' => $returnurl,
													'ids'=>$question->id,
													'tocatid'=> $tocatid));
			if ($cmid){
				$movecontexturl->param('cmid', $cmid);
			} else {
				$movecontexturl->param('courseid', $COURSE->id);
			}
			redirect($movecontexturl->out());
		}
	}

	$question = $QTYPES[$question->qtype]->save_question($question, $fromform, $COURSE, $wizardnow);
	if (($QTYPES[$question->qtype]->finished_edit_wizard($fromform)) || $movecontext){
		if ($inpopup) {
			notify(get_string('changessaved'), '');
			close_window(3);
		} else {
			redirect($returnurl);
		}
	} else {
		$nexturlparams = array('returnurl'=>$returnurl);
		if (isset($fromform->nextpageparam) && is_array($fromform->nextpageparam)){
			$nexturlparams += $fromform->nextpageparam;//useful for passing data to the next page which is not saved in the database
		}
		$nexturlparams['id'] = $question->id;
		$nexturlparams['wizardnow'] = $fromform->wizard;
		$nexturl = new moodle_url('question.php', $nexturlparams);
		if ($cmid){
			$nexturl->param('cmid', $cmid);
		} else {
			$nexturl->param('courseid', $COURSE->id);
		}
		redirect($nexturl->out());
	}
} else {

	list($streditingquestion,) = $QTYPES[$question->qtype]->get_heading();
	if ($cm !== null) {
		$strmodule = get_string('modulename', $cm->modname);
		$strupdatemodule = has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $COURSE->id))
			? update_module_button($cm->id, $cm->course, $strmodule)
			: "";

		$streditingmodule = get_string('editinga', 'moodle', $strmodule);

		$navlinks = array();
		$navlinks[] = array('name' => get_string('modulenameplural', $cm->modname), 'link' => "$CFG->wwwroot/mod/{$cm->modname}/index.php?id=$cm->course", 'type' => 'activity');
		$navlinks[] = array('name' => format_string($module->name), 'link' => "$CFG->wwwroot/mod/{$cm->modname}/view.php?id={$cm->id}", 'type' => 'title');
		if (stripos($returnurl, "$CFG->wwwroot/mod/{$cm->modname}/view.php")!== 0){
			//don't need this link if returnurl returns to view.php
			$navlinks[] = array('name' => $streditingmodule, 'link' => $returnurl, 'type' => 'title');
		}
		$navlinks[] = array('name' => $streditingquestion, 'link' => '', 'type' => 'title');
		$navigation = build_navigation($navlinks);
		print_header_simple($streditingquestion, '', $navigation, "", "", true, $strupdatemodule);

	} else {
		$navlinks = array();
		$navlinks[] = array('name' => get_string('editquestions', "quiz"), 'link' => $returnurl, 'type' => 'title');
		$navlinks[] = array('name' => $streditingquestion, 'link' => '', 'type' => 'title');
		$strediting = '<a href="edit.php?courseid='.$COURSE->id.'">'.
				get_string("editquestions", "quiz").'</a> -> '.$streditingquestion;
		$navigation = build_navigation($navlinks);
		print_header_simple($streditingquestion, '', $navigation);
	}


	// Display a heading, question editing form and possibly some extra content needed for
	// for this question type.
	$QTYPES[$question->qtype]->display_question_editing_page($mform, $question, $wizardnow);
	print_footer($COURSE);
}
?>
